Lia & Keith: Amplitude
Q: Difference in amplitude between saxophonist and singer when playing/singing with natural resistance?
Decibel meter - measures dB
Played Bb concert on sax
"A Weighting" ("actual" reading of the dBs - more accurate)
"C Weighting" (more replicates human hearing - receives high frequencies less intensely - less accurate, loses some sound)
Soprano sax is louder (larger amplitude) because the instrument itself is an amplifier.
The dial is like an old scale - twist it to an approximation, and then the needle will show you +/-
When you double the distance, the amplitude of the constant sound drops 6 dB
"U Setting" (measures lower frequencies that can't all be heard by humans: 3-100 mHz)
Ray & Dylan: Marimba
Q: Determine length of the tubes beneath a marimba - find formula for finding the length of the tube to make it vibrate as much as possible
Found wavelength and length of A-440 tube - wavelength found by c (speed of sound: 1130) / f (440Hz)
The length of the tubes on the marimba are 1/4 the actual size
length (of tube) = 4 / wavelength (of note)
To amplify a certain frequency, you multiply your fundamental by the constant of 4. Then divide the speed of sound by your new frequency.
Q: Difference in amplitude between saxophonist and singer when playing/singing with natural resistance?
Decibel meter - measures dB
Played Bb concert on sax
"A Weighting" ("actual" reading of the dBs - more accurate)
"C Weighting" (more replicates human hearing - receives high frequencies less intensely - less accurate, loses some sound)
Soprano sax is louder (larger amplitude) because the instrument itself is an amplifier.
The dial is like an old scale - twist it to an approximation, and then the needle will show you +/-
When you double the distance, the amplitude of the constant sound drops 6 dB
"U Setting" (measures lower frequencies that can't all be heard by humans: 3-100 mHz)
Ray & Dylan: Marimba
Q: Determine length of the tubes beneath a marimba - find formula for finding the length of the tube to make it vibrate as much as possible
Found wavelength and length of A-440 tube - wavelength found by c (speed of sound: 1130) / f (440Hz)
The length of the tubes on the marimba are 1/4 the actual size
length (of tube) = 4 / wavelength (of note)
To amplify a certain frequency, you multiply your fundamental by the constant of 4. Then divide the speed of sound by your new frequency.